Is there intelligent life on other planets?
When you say, "Not in our solar system," are you making a comment on the inhabitants of Earth?
Most of the time, there's no intelligent life on this planet.
Yes. Not in our own solar system but certainly on one of the Zillion other planets out there.
I think they did, and chose to pass us by.
Almost certainly, but not that we've found or has found us yet.
Often when making this call, people cite the almost infinite number of stars and planets to make it seem that it is almost probable.
But the actual list of requisite circumstances that need to happen in order to allow for the development of intelligent life can quickly bring those odds much closer to a 50/50 call, and maybe a lot less than that.
It's not simply having a planet the right distance, with the right orbit, with the right rotation rate.
In the timeline of Earth, intelligent life has only existed a few minutes. All of the almost infinite factors, (that is an infinite that offsets the previous infinite), that need to be in place during all that time makes it a lot less likely.